On Thu, 2007-08-02 at 09:34 -0700, Kevin Anderson wrote:
> The Jones filter in the Scout and in the Argonaut/Delta II,
> while both Jones filters, are similar, yet very different
> The filter in the Scout, which I am familiar with, has a fixed
> center frequency and is only adjustable in width. To make the
> filtering even more impressive (in my opinion), the center
> frequency is set appropriately (or they adjusted the filter
> shape somehow) to provide particular filtering of the opposite
> sideband/carrier frequency. The eight crystals of the Scout
> Jones filter are set up as two parts, with five crystals in a
> fixed filter, and the remaining three crystals used for the
> variable part.
> The Jones filter in the Delta II is different. While also a
> Jones filter, the ability to adjust the passband center makes
> this version a very different animal. For me, adjusting the
> Jones filter was frustrating, the one time I used one, to say
> the least, as I continually having to adjust both the center
> frequency and width. After an afternoon of using it, I never
> did find the magic combinations to kill opposite sidebands, etc.
> What made things particularly challenging was that I was
> operating at friend's house in a contest, where I was
> alternating back and forth between times operating with CW and
> with SSB, each of which required different settings of the Jones
> filter. Eventually I gave up and ran the filter wide open,
> depending on my ears to do the filtering.
> I agree that the use of the Jones filter in the Scout is a very
> efficient, yet effective, filter for that category of radio.
Thanks Kevin for that bit of info. I was not aware they are different in
their respective radios.
I'm sure we all learned from this useful information.
(I got the name right, this time) smile
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